| 摘要 |
A magnetic toner comprises a binder resin and a magnetic material. The magnetic toner has a volume average particle diameter of not more than 9 mu m and the variation coefficient of particle size distribution, ( sigma T/D)x100, of the magnetic toner satisfies the following condition: 25</=( sigma T/D)x100</=35 where D represents a volume average particle diameter ( mu m) of the magnetic toner and sigma T represents a value of standard deviation of the volume particle size distribution of the magnetic toner, The magnetic material has a number average particle diameter of from 0.1 mu m to 0.2 mu m and the variation coefficient of particle size distribution, ( sigma / &upbar& X)x100, of the magnetic material satisfies the following condition: ( sigma / &upbar& X)x100</=40 where &upbar& X represents a number average particle diameter ( mu m) of the magnetic material and sigma represents a value of standard deviation of the number particle size distribution of the magnetic material.
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